\documentclass[landscape]{article}
\setlength{\pdfpagewidth}{11in} \setlength{\pdfpageheight}{8.5in}
\begin{document}
\begin{tabular}{lcccccccccccc}
\multicolumn{13}{c}{Effect} \\
\multicolumn{13}{c}{)} \\ \hline
 & (1) & (2) & (3) & (4) & (5) & (6) & (7) & (8) & (9) & (10) & (11) & (12) \\
VARIABLES & changepop13001500\_std & changepop13001600\_std & changepop13001700\_std & changepop13001750\_std & changepop13001500\_std & changepop13001600\_std & changepop13001700\_std & changepop13001750\_std & changepop13001500\_std & changepop13001600\_std & changepop13001700\_std & changepop13001750\_std \\ \hline
 &  &  &  &  &  &  &  &  &  &  &  &  \\
m\_directsea\_AMNB\_10 & 0.018*** & 0.020** & 0.014** & 0.010* &  &  &  &  &  &  &  &  \\
 & [0.005] & [0.008] & [0.007] & [0.005] &  &  &  &  &  &  &  &  \\
m\_riversea\_wide\_AMNB\_50 & 0.018* & 0.024 & 0.037** & 0.038** &  &  &  &  &  &  &  &  \\
 & [0.011] & [0.017] & [0.016] & [0.015] &  &  &  &  &  &  &  &  \\
m\_rivernosea\_all & 0.002 & 0.005 & 0.006** & 0.005* & 0.001 & 0.005 & 0.005* & 0.004* &  &  &  &  \\
 & [0.005] & [0.005] & [0.003] & [0.003] & [0.005] & [0.005] & [0.003] & [0.003] &  &  &  &  \\
m\_directsea\_wide\_M\_50 &  &  &  &  & 0.021*** & 0.023*** & 0.016** & 0.012** &  &  &  &  \\
 &  &  &  &  & [0.005] & [0.008] & [0.007] & [0.006] &  &  &  &  \\
m\_directsea\_wide\_A\_50 &  &  &  &  & 0.013 & 0.015 & 0.020* & 0.024* &  &  &  &  \\
 &  &  &  &  & [0.011] & [0.014] & [0.012] & [0.012] &  &  &  &  \\
m\_wide50\_mon &  &  &  &  &  &  &  &  & 0.025*** & 0.026*** & 0.017** & 0.013** \\
 &  &  &  &  &  &  &  &  & [0.006] & [0.008] & [0.008] & [0.006] \\
m\_wide50\_nonmon &  &  &  &  &  &  &  &  & 0.010 & 0.008 & 0.003 & 0.003 \\
 &  &  &  &  &  &  &  &  & [0.007] & [0.008] & [0.006] & [0.005] \\
m\_rivno50\_mon &  &  &  &  &  &  &  &  & 0.004 & 0.009 & 0.010* & 0.007* \\
 &  &  &  &  &  &  &  &  & [0.006] & [0.009] & [0.005] & [0.004] \\
m\_rivno50\_nonmon &  &  &  &  &  &  &  &  & 0.006 & 0.010 & 0.007 & 0.006 \\
 &  &  &  &  &  &  &  &  & [0.006] & [0.006] & [0.005] & [0.005] \\
m\_mon\_other &  &  &  &  &  &  &  &  & 0.006 & 0.007 & 0.002 & 0.001 \\
 &  &  &  &  &  &  &  &  & [0.005] & [0.008] & [0.007] & [0.005] \\
 &  &  &  &  &  &  &  &  &  &  &  &  \\
Observations & 164 & 164 & 164 & 164 & 164 & 164 & 164 & 164 & 164 & 164 & 164 & 164 \\
R-squared & 0.295 & 0.384 & 0.388 & 0.399 & 0.312 & 0.392 & 0.375 & 0.391 & 0.313 & 0.377 & 0.307 & 0.314 \\
 year & 1500 & 1600 & 1700 & 1750 & 1500 & 1600 & 1700 & 1750 & 1500 & 1600 & 1700 & 1750 \\ \hline
\end{tabular}
\end{document}
